To find the area of 4 walls of a square room, we need to know the length of one of its sides. Since the volume of the room is 256 cubic meters, we can calculate the length of one side as follows:
side = cube root of 256 cubic meters = cube root of 256 = 4 meters
So, the area of one wall of the square room is 4 meters x 4 meters = 16 square meters.
Since there are 4 walls in the room, the total area of the 4 walls is 4 x 16 square meters = 64 square meters.
The cost of painting the 4 walls of the room would be 64 square meters x Rs 50 per square meter = Rs 3200.
To find the cost of carpeting the floor of the room, we need to find the area of the floor. Since the room is a square, the area of the floor would be the square of the length of one side, which is 4 meters.
Area of floor = 4 meters x 4 meters = 16 square meters
The cost of carpeting the floor would be 16 square meters x Rs 99 per square meter = Rs 1584.